某街道诊所一天内接诊了3名当地患儿，症状为全身凹陷性水肿，嘴唇轻度青紫，心音稍低钝等

防爆的基本原则有（）。

A.严格控制着火源

B.监视酝酿期特征

C.防止爆炸性混合物的形成

D.切断爆炸传播途径

温度为T时，向2.0L恒容密闭容器中充入1.0 mol PCl₅，反应PCl₅(g) PCl₃(g)＋Cl₂(g)经一段时间后达到平衡。反应过程中测定的部分数据见下表：下列说法正确的是

t/s	0	50	150	250	350
n(PCl3)/ mol	0	0.16	0.19	0.20	0.20

A．反应在前50 s的平均速率为v(PCl₃)=0.0032mol·L^－1·s^－1

B．保持其他条件不变，升高温度，平衡时c(PCl₃)=0.11mol·L^－1，则反应的△H＜0

C．相同温度下，起始时向容器中充入1.0mol PCl₅、0.20mol PCl₃和0.20molCl₂，达到平衡前v(正)＞v(逆)

D．相同温度下，起始时向容器中充入2.0mol PCl₃和2.0molCl₂，达到平衡时，PCl₃的转化率小于80%

培养液内一般需要加入的抗生素是（）

A.青霉素

B.链霉素

C.庆大霉素

D.青霉素和链霉素

E.红霉素

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines （） showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR). Following the SCR, the team derives （） requirements for the system from the high level requirements and the system and operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.

The starting point is usually a set of high-level requirements from the （） that describe the project or problem.

A．producer

B．customer

C．programmer

D．analyser

甲硫氧嘧啶最严重的不良反应是

A．药疹、药热
B．关节痛、淋巴结肿大
C．腹痛、腹泻、恶心、呕吐
D．血管神经性水肿，喉头水肿
E．粒细胞缺乏症